US20040159162A1 - Strain gage - Google Patents
Strain gage Download PDFInfo
- Publication number
- US20040159162A1 US20040159162A1 US10/368,922 US36892203A US2004159162A1 US 20040159162 A1 US20040159162 A1 US 20040159162A1 US 36892203 A US36892203 A US 36892203A US 2004159162 A1 US2004159162 A1 US 2004159162A1
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- US
- United States
- Prior art keywords
- strain
- strain gage
- semi
- rigid substrate
- gage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
Definitions
- a strain gage is a strain sensitive resistive device used to measure mechanical strain.
- a strain gage is typically adhesively bonded to a surface and then measured changes in the resistance of the strain gage are associated with various effects depending upon the configuration of the strain gage. Strain gages can be used to measure bending, axial and torsional load or other strain effects.
- a strain gage is made of a resistive foil which is typically photoetched, ion milled, or otherwise cut to form a pattern to produce a resistance.
- Foil material is usually a Ni-Cu or Ni-Cr or Manganese alloy of 50 microinches to 200 microinches in thickness.
- a typical resistance value associated with a strain gage is 120 ohms.
- the foil pattern is usually bonded to a very thin flexible polymer backing with an epoxy or similar resin or other cement.
- the polymer backing is thin (0.5 mils) to enhance flexibility.
- [0003] is the relative resistance change due to the strain, and k is a constant.
- the constant k of the strain gage is the proportionality factor between the relative change of the resistance and strain in the gage. Sometimes k is called the gage factor.
- the constant k is typically approximately 2.
- strain gage Since the strain gage is very flexible, it can be applied to curved surfaces of very small radius. Because the gage is very flexible and “sticky” from static charge, it presents certain severe disadvantages.
- strain gage cannot be automatically sorted in vibrating bowls for packaging on a tape. Instead, strain gages are packaged individually in tray pockets or plastic folders, resulting in cumbersome and costly handling requirements.
- a further problem is that such a prior art strain gage is fragile during handling by hand or machine.
- strain gages are difficult to install. Strain gages are cemented to the structure for which strain is measured. Electrical lead attachments must be made and generally such handling requirements create inconvenience and cost. Therefore, it is a primary object of the present invention to improve upon the state of the art.
- Yet another object of the present invention is to provide a strain gage that need not be individually packaged.
- a further object of the present invention is to provide a strain gage that is robust and easier to handle.
- a still further object of the present invention is to provide a strain gage that is conducive to easy installation.
- the present invention provides for a strain gage that is simpler to manufacture, handle and install.
- the strain gage includes a semi-rigid substrate having a thickness of about 1 to about 30 mils, a resistive strain sensitive foil bonded to the semi-rigid substrate, and a first and a second terminal operatively connected to the resistive foil.
- the strain gage can be used on flat or slightly curved surfaces. Because a semi-rigid substrate is used, the strain gage is easier to handle and to install.
- the strain gage can include an anti-static layer attached to a surface of the semi-rigid substrate which further makes the strain gage conducive to handling.
- the anti-static layer also facilitates soldering the strain gage to a metal part.
- a method of manufacturing strain gages includes bonding a resistive strain sensitive foil to a semi-rigid substrate, the resistive foil and semi-rigid substrate being selected to provide a gage factor equivalent to that of a prior art strain gage employing the same resistance foil (typically about 2), and attaching a first and second terminal to the resistive strain sensitive foil.
- An anti-static layer can also be attached to a surface of the resistive strain sensitive foil.
- FIG. 1 is a front view of a strain gage according to one embodiment of the invention.
- FIG. 2 is a side view of a strain gage according to one embodiment of the invention.
- the present invention relates to strain gages.
- the present invention relates to providing a strain gage that is semi-rigid and not flexible in order to avoid the disadvantages of the prior art.
- the strain gage of the present invention is suitable for use on flat or slightly curved surfaces and provides advantages in ease of manufacturing and installation.
- the strain gage includes the same type of serpentine resistive foil pattern associated with prior art strain gages, but the foil pattern is bonded to a semi-rigid substrate made of fiberglass, or polyimide resin, or other stiff material of about 1 mil to about 30 mils in thickness.
- the sensitivity of the resistor to strain, k remains the same despite the thickness and rigidity of the device.
- a strain gage 10 includes a substrate 12 .
- the substrate 12 is a semi-rigid substrate as opposed to being a flexible substrate of the prior art.
- the present invention contemplates that various materials can be used, including fiberglass, plastic, glass, reinforced epoxy, polyimide or other stiff or semi-rigid material.
- the thickness of the substrate is about 1 to about 30 mils. The thickness of the substrate is therefore sufficiently great that the substrate remains semi-rigid.
- Bonded to the semi-rigid substrate 12 is a resistive strain sensitive foil 16 .
- Various types of bonding agents, cements, epoxies, or resins can be used to create the bond 14 between the substrate 12 and the foil 16 .
- a first terminal 18 A and a second terminal 18 B are operatively connected to the foil 16 . These terminals 18 A and 18 B can be presoldered or bumped to facilitate lead attachment to the strain gage 20 .
- the anti-static layer 20 can be either on the surface of the foil 16 or on the opposite side or on both sides.
- the anti-static layer 20 provides the advantage of easing the sorting as vibrating bowls can be used in the manufacturing process.
- the anti-static layer 20 prevents individual strain gages 10 from sticking together in the manufacturing process.
- the anti-static layer is preferably copper or solder or other low resistance metal.
- a metal layer can be used to solder the strain gage 10 to a metal part or other surface 24 instead of using an adhesive such as glue. This can simplify the installation process of the strain gage of the present invention.
- FIG. 2 provides a top view of one embodiment of a strain gage of the present invention.
- the foil 16 has a serpentine pattern 22 , although the present invention fully contemplates that other types of patterns can be used in order to arrive at a desired resistance.
- the foil pattern 22 provides a resistance of between 50 ohms and 10,000 ohms.
- the strain factor k that results from the strain gage 10 is essentially the same as if the foil were attached to a very flexible backing of 0.5 mils. Thus, the k is normally about 2.
- the present invention contemplates variations in the type and thickness of the semi-rigid substrate, the type of foil, the resistance of the foil, the type of cement or other bonding agent used to attach the foil, the type of material used for the anti-static layer, and the method to attach the improved strain gage to the structure (adhesively bonded, soldered, etc.). These and other variations and equivalents are within the spirit and scope of the invention.
Abstract
An improved strain gage is disclosed. The strain gage includes a semi-rigid substrate having a thickness of about 1 to about 30 mils, a resistive strain sensitive foil bonded to the semi-rigid substrate for providing a resistance varying with strain associated with a surface to which the strain gage is attached, and a first and a second terminal operatively connected to the resistive strain sensitive foil.
Description
- The present invention relates to strain gages. A strain gage is a strain sensitive resistive device used to measure mechanical strain. A strain gage is typically adhesively bonded to a surface and then measured changes in the resistance of the strain gage are associated with various effects depending upon the configuration of the strain gage. Strain gages can be used to measure bending, axial and torsional load or other strain effects. A strain gage is made of a resistive foil which is typically photoetched, ion milled, or otherwise cut to form a pattern to produce a resistance. Foil material is usually a Ni-Cu or Ni-Cr or Manganese alloy of 50 microinches to 200 microinches in thickness. A typical resistance value associated with a strain gage is 120 ohms. The foil pattern is usually bonded to a very thin flexible polymer backing with an epoxy or similar resin or other cement. The polymer backing is thin (0.5 mils) to enhance flexibility. Such a device is strain sensitive according to the formula:
-
- is the relative resistance change due to the strain, and k is a constant. The constant k of the strain gage is the proportionality factor between the relative change of the resistance and strain in the gage. Sometimes k is called the gage factor. The constant k is typically approximately 2.
- Since the strain gage is very flexible, it can be applied to curved surfaces of very small radius. Because the gage is very flexible and “sticky” from static charge, it presents certain severe disadvantages.
- One problem with prior art strain gages relates to the manufacturing process. A strain gage cannot be automatically sorted in vibrating bowls for packaging on a tape. Instead, strain gages are packaged individually in tray pockets or plastic folders, resulting in cumbersome and costly handling requirements.
- A further problem is that such a prior art strain gage is fragile during handling by hand or machine.
- Yet another problem is that strain gages are difficult to install. Strain gages are cemented to the structure for which strain is measured. Electrical lead attachments must be made and generally such handling requirements create inconvenience and cost. Therefore, it is a primary object of the present invention to improve upon the state of the art.
- It is another object of the present invention to provide a strain gage that can be automatically sorted and packaged on a tape.
- Yet another object of the present invention is to provide a strain gage that need not be individually packaged.
- A further object of the present invention is to provide a strain gage that is robust and easier to handle.
- A still further object of the present invention is to provide a strain gage that is conducive to easy installation.
- One or more of these and/or other objects, features, or advantages of the present invention will become apparent from the description and claims that follow.
- The present invention provides for a strain gage that is simpler to manufacture, handle and install. The strain gage includes a semi-rigid substrate having a thickness of about 1 to about 30 mils, a resistive strain sensitive foil bonded to the semi-rigid substrate, and a first and a second terminal operatively connected to the resistive foil. The strain gage can be used on flat or slightly curved surfaces. Because a semi-rigid substrate is used, the strain gage is easier to handle and to install.
- The strain gage can include an anti-static layer attached to a surface of the semi-rigid substrate which further makes the strain gage conducive to handling. The anti-static layer also facilitates soldering the strain gage to a metal part.
- According to another aspect of the present invention, a method of manufacturing strain gages is provided. The method includes bonding a resistive strain sensitive foil to a semi-rigid substrate, the resistive foil and semi-rigid substrate being selected to provide a gage factor equivalent to that of a prior art strain gage employing the same resistance foil (typically about 2), and attaching a first and second terminal to the resistive strain sensitive foil. An anti-static layer can also be attached to a surface of the resistive strain sensitive foil.
- FIG. 1 is a front view of a strain gage according to one embodiment of the invention.
- FIG. 2 is a side view of a strain gage according to one embodiment of the invention.
- The present invention relates to strain gages. In particular, the present invention relates to providing a strain gage that is semi-rigid and not flexible in order to avoid the disadvantages of the prior art. The strain gage of the present invention is suitable for use on flat or slightly curved surfaces and provides advantages in ease of manufacturing and installation.
- The strain gage includes the same type of serpentine resistive foil pattern associated with prior art strain gages, but the foil pattern is bonded to a semi-rigid substrate made of fiberglass, or polyimide resin, or other stiff material of about 1 mil to about 30 mils in thickness. The sensitivity of the resistor to strain, k, remains the same despite the thickness and rigidity of the device.
- As shown in FIG. 1, a
strain gage 10 includes asubstrate 12. Thesubstrate 12 is a semi-rigid substrate as opposed to being a flexible substrate of the prior art. The present invention contemplates that various materials can be used, including fiberglass, plastic, glass, reinforced epoxy, polyimide or other stiff or semi-rigid material. The thickness of the substrate is about 1 to about 30 mils. The thickness of the substrate is therefore sufficiently great that the substrate remains semi-rigid. Bonded to thesemi-rigid substrate 12 is a resistive strainsensitive foil 16. Various types of bonding agents, cements, epoxies, or resins can be used to create thebond 14 between thesubstrate 12 and thefoil 16. - A
first terminal 18A and asecond terminal 18B are operatively connected to thefoil 16. Theseterminals strain gage 20. - Also shown in FIG. 1 is an
anti-static layer 20. Theanti-static layer 20 can be either on the surface of thefoil 16 or on the opposite side or on both sides. Theanti-static layer 20 provides the advantage of easing the sorting as vibrating bowls can be used in the manufacturing process. Theanti-static layer 20 prevents individual strain gages 10 from sticking together in the manufacturing process. - The anti-static layer is preferably copper or solder or other low resistance metal. A metal layer can be used to solder the
strain gage 10 to a metal part orother surface 24 instead of using an adhesive such as glue. This can simplify the installation process of the strain gage of the present invention. - FIG. 2 provides a top view of one embodiment of a strain gage of the present invention. In FIG. 2, the
foil 16 has aserpentine pattern 22, although the present invention fully contemplates that other types of patterns can be used in order to arrive at a desired resistance. Preferably thefoil pattern 22 provides a resistance of between 50 ohms and 10,000 ohms. The strain factor k that results from thestrain gage 10 is essentially the same as if the foil were attached to a very flexible backing of 0.5 mils. Thus, the k is normally about 2. - An improved strain gage has now been disclosed. The present invention contemplates variations in the type and thickness of the semi-rigid substrate, the type of foil, the resistance of the foil, the type of cement or other bonding agent used to attach the foil, the type of material used for the anti-static layer, and the method to attach the improved strain gage to the structure (adhesively bonded, soldered, etc.). These and other variations and equivalents are within the spirit and scope of the invention.
Claims (18)
1. A strain gage comprising:
a semi-rigid substrate having a thickness of about 1 to about 30 mils;
a resistive strain sensitive foil bonded to the semi-rigid substrate for providing a resistance varying with strain associated with a surface to which the strain gage is attached; and
a first and a second terminal operatively connected to the resistive strain sensitive foil.
2. The strain gage of claim 1 wherein the resistive strain sensitive foil provides a resistance of between about 50 and about 10,000 ohms.
3. The strain gage of claim 1 further comprising an anti-static layer overlaying a surface of the resistive strain sensitive foil.
4. The strain gage of claim 3 wherein the anti-static layer is adapted for soldering the strain gage to a metal part.
5. The strain gage of claim 1 further comprising an anti-static layer overlaying a surface of the semi-rigid substrate opposite the resistive strain sensitive foil.
6. The strain gage of claim 5 wherein the anti-static layer is adapted for soldering the strain gage to a metal part.
7. The strain gage of claim 1 wherein the semi-rigid substrate is glass reinforced epoxy.
8. The strain gage of claim 1 wherein the semi-rigid substrate is polyimide.
9. The strain gage of claim 1 wherein the semi-rigid substrate is phenolic.
10. The strain gage of claim 1 wherein the first and second terminals are presoldered for facilitating lead attachment.
11. The strain gage of claim 1 having a k of about 2.
12. A method for manufacturing a strain gage, comprising:
bonding a resistive strain sensitive foil to a semi-rigid substrate, the resistive strain sensitive foil and semi-rigid substrate selected to provide a strain factor of about 2; and
attaching a first and second terminal to the resistive strain sensitive foil.
13. The method of claim 12 further comprising attaching an anti-static layer to a surface of the resistive strain sensitive foil.
14. The method of claim 12 wherein a thickness of the semi-rigid substrate is about 1 to about 30 mils.
15. The method of claim 12 wherein the anti-static layer is metal.
16. The method of claim 12 further comprising packaging the strain gage on a tape.
17. The method of claim 12 further comprising sorting the strain gage using a vibrating bowl.
18. A strain gage, comprising:
a semi-rigid substrate having a thickness of about 1 to about 30 mils;
a resistive strain sensitive foil bonded to the semi-rigid substrate for providing a resistance varying with strain associated with a surface to which the strain gage is attached;
a first and second terminal operatively connected to the resistive strain sensitive foil;
an anti-static layer overlaying a surface of the resistive strain sensitive foil;
the semi-rigid substrate adapting the strain gage for packaging on a tape;
the anti-static layer adapting the strain gage for sorting with vibrating bowls.
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/368,922 US20040159162A1 (en) | 2003-02-19 | 2003-02-19 | Strain gage |
AU2003287046A AU2003287046A1 (en) | 2003-02-19 | 2003-10-09 | Strain gage |
JP2004568566A JP4084803B2 (en) | 2003-02-19 | 2003-10-09 | Strain gauge |
EP03777566A EP1530708B1 (en) | 2003-02-19 | 2003-10-09 | Strain gage |
DE60305326T DE60305326T2 (en) | 2003-02-19 | 2003-10-09 | STRAIN GAUGE |
PCT/US2003/032105 WO2004074800A1 (en) | 2003-02-19 | 2003-10-09 | Strain gage |
CNB200380100249XA CN100357699C (en) | 2003-02-19 | 2003-10-09 | Strain gage |
AT03777566T ATE326688T1 (en) | 2003-02-19 | 2003-10-09 | STRAIN GAUGE |
TW093113646A TWI277728B (en) | 2003-02-19 | 2004-05-14 | Strain gage and method for manufacturing the same |
US10/958,545 US7150199B2 (en) | 2003-02-19 | 2004-10-05 | Foil strain gage for automated handling and packaging |
HK05105053A HK1072465A1 (en) | 2003-02-19 | 2005-06-16 | Strain gage |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/368,922 US20040159162A1 (en) | 2003-02-19 | 2003-02-19 | Strain gage |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/958,545 Continuation-In-Part US7150199B2 (en) | 2003-02-19 | 2004-10-05 | Foil strain gage for automated handling and packaging |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040159162A1 true US20040159162A1 (en) | 2004-08-19 |
Family
ID=32850243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/368,922 Abandoned US20040159162A1 (en) | 2003-02-19 | 2003-02-19 | Strain gage |
Country Status (10)
Country | Link |
---|---|
US (1) | US20040159162A1 (en) |
EP (1) | EP1530708B1 (en) |
JP (1) | JP4084803B2 (en) |
CN (1) | CN100357699C (en) |
AT (1) | ATE326688T1 (en) |
AU (1) | AU2003287046A1 (en) |
DE (1) | DE60305326T2 (en) |
HK (1) | HK1072465A1 (en) |
TW (1) | TWI277728B (en) |
WO (1) | WO2004074800A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050039539A1 (en) * | 2003-02-19 | 2005-02-24 | Vishay Intertechnology, Inc. | Foil strain gage for automated handling and packaging |
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DE102006021423B4 (en) * | 2006-05-05 | 2016-06-02 | Hottinger Baldwin Messtechnik Gmbh | Strain gauges for measuring sensor |
CN101614522B (en) * | 2009-07-31 | 2011-03-02 | 中国航天科技集团公司第四研究院第四十四研究所 | Manufacturing method of resistance strain gage based on ion beam technology |
CN102221325B (en) * | 2010-04-13 | 2013-05-08 | 精量电子(深圳)有限公司 | Method and equipment for separating foil gauge |
CN102730632A (en) * | 2012-07-12 | 2012-10-17 | 西北工业大学 | Method for processing metal film strainometer based on MEMS (Micro-electromechanical Systems) |
CN103727871A (en) * | 2013-12-20 | 2014-04-16 | 广西科技大学 | Resistance strain gauge |
CN105740490B (en) * | 2014-12-10 | 2018-11-16 | 中国飞机强度研究所 | A kind of dummy strain piece implementation method |
CN106289598A (en) * | 2016-10-31 | 2017-01-04 | 中航电测仪器股份有限公司 | A kind of strain ga(u)ge for concrete stress test |
JP2019066453A (en) | 2017-09-29 | 2019-04-25 | ミネベアミツミ株式会社 | Strain gauge |
JP2019066312A (en) | 2017-09-29 | 2019-04-25 | ミネベアミツミ株式会社 | Strain gauge |
WO2019065841A1 (en) * | 2017-09-29 | 2019-04-04 | ミネベアミツミ株式会社 | Strain gauge |
JP2019066454A (en) * | 2017-09-29 | 2019-04-25 | ミネベアミツミ株式会社 | Strain gauge and sensor module |
JP6793103B2 (en) | 2017-09-29 | 2020-12-02 | ミネベアミツミ株式会社 | Strain gauge |
JP2019113411A (en) | 2017-12-22 | 2019-07-11 | ミネベアミツミ株式会社 | Strain gauge and sensor module |
JP2019184344A (en) | 2018-04-05 | 2019-10-24 | ミネベアミツミ株式会社 | Strain gauge and manufacturing method therefor |
JP2020053433A (en) * | 2018-09-21 | 2020-04-02 | Koa株式会社 | Strain sensor resistor |
JPWO2020085247A1 (en) | 2018-10-23 | 2021-09-16 | ミネベアミツミ株式会社 | Accelerator pedal, steering, door, door opening and closing system |
CN109860384B (en) * | 2019-01-17 | 2022-07-01 | 业成科技(成都)有限公司 | Strain gauge driving piezoelectric device |
JP7406517B2 (en) * | 2020-03-24 | 2023-12-27 | ミネベアミツミ株式会社 | strain gauge |
DE202022002779U1 (en) | 2022-02-11 | 2023-05-22 | Balluff Gmbh | Strain gauge and overall device with such a strain gauge |
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US4307371A (en) * | 1977-06-27 | 1981-12-22 | Hottinger Baldwin Measurements, Inc. | Method and apparatus for covering a foil strain gauge |
US4310823A (en) * | 1979-01-20 | 1982-01-12 | W. C. Heraeus Gmbh | Strain gauge strip element and method of its manufacture |
US4432247A (en) * | 1980-11-29 | 1984-02-21 | Tokyo Electric Co. | Load cell having thin film strain gauges |
US5140849A (en) * | 1990-07-30 | 1992-08-25 | Agency Of Industrial Science And Technology | Rolling bearing with a sensor unit |
US5328551A (en) * | 1992-10-28 | 1994-07-12 | Eaton Corporation | Method of making high output strain gage |
US5508676A (en) * | 1992-07-15 | 1996-04-16 | Commissariat A L'energie Atomique | Strain gauge on a flexible support and transducer equipped with said gauge |
US5780746A (en) * | 1996-08-07 | 1998-07-14 | Fel-Pro Incorporated | Minimum thickness force sensor with temperature compensation |
US6494343B2 (en) * | 2001-02-15 | 2002-12-17 | Advanced Technology Materials, Inc. | Fluid storage and dispensing system featuring ex-situ strain gauge pressure monitoring assembly |
Family Cites Families (2)
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WO2001004594A1 (en) * | 1999-07-09 | 2001-01-18 | Nok Corporation | Strain gauge |
GB0006551D0 (en) * | 2000-03-17 | 2000-05-10 | Ind Dataloggers Limited | Improved train gauge devices |
-
2003
- 2003-02-19 US US10/368,922 patent/US20040159162A1/en not_active Abandoned
- 2003-10-09 EP EP03777566A patent/EP1530708B1/en not_active Expired - Lifetime
- 2003-10-09 CN CNB200380100249XA patent/CN100357699C/en not_active Expired - Fee Related
- 2003-10-09 JP JP2004568566A patent/JP4084803B2/en not_active Expired - Lifetime
- 2003-10-09 AU AU2003287046A patent/AU2003287046A1/en not_active Abandoned
- 2003-10-09 AT AT03777566T patent/ATE326688T1/en not_active IP Right Cessation
- 2003-10-09 DE DE60305326T patent/DE60305326T2/en not_active Expired - Lifetime
- 2003-10-09 WO PCT/US2003/032105 patent/WO2004074800A1/en active IP Right Grant
-
2004
- 2004-05-14 TW TW093113646A patent/TWI277728B/en not_active IP Right Cessation
-
2005
- 2005-06-16 HK HK05105053A patent/HK1072465A1/en not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4307371A (en) * | 1977-06-27 | 1981-12-22 | Hottinger Baldwin Measurements, Inc. | Method and apparatus for covering a foil strain gauge |
US4310823A (en) * | 1979-01-20 | 1982-01-12 | W. C. Heraeus Gmbh | Strain gauge strip element and method of its manufacture |
US4432247A (en) * | 1980-11-29 | 1984-02-21 | Tokyo Electric Co. | Load cell having thin film strain gauges |
US5140849A (en) * | 1990-07-30 | 1992-08-25 | Agency Of Industrial Science And Technology | Rolling bearing with a sensor unit |
US5508676A (en) * | 1992-07-15 | 1996-04-16 | Commissariat A L'energie Atomique | Strain gauge on a flexible support and transducer equipped with said gauge |
US5328551A (en) * | 1992-10-28 | 1994-07-12 | Eaton Corporation | Method of making high output strain gage |
US5780746A (en) * | 1996-08-07 | 1998-07-14 | Fel-Pro Incorporated | Minimum thickness force sensor with temperature compensation |
US6494343B2 (en) * | 2001-02-15 | 2002-12-17 | Advanced Technology Materials, Inc. | Fluid storage and dispensing system featuring ex-situ strain gauge pressure monitoring assembly |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050039539A1 (en) * | 2003-02-19 | 2005-02-24 | Vishay Intertechnology, Inc. | Foil strain gage for automated handling and packaging |
US7150199B2 (en) | 2003-02-19 | 2006-12-19 | Vishay Intertechnology, Inc. | Foil strain gage for automated handling and packaging |
WO2006041577A1 (en) * | 2004-10-05 | 2006-04-20 | Vishay Intertechnology, Inc. | Foil strain gage for automated handling and packaging |
Also Published As
Publication number | Publication date |
---|---|
DE60305326D1 (en) | 2006-06-22 |
DE60305326T2 (en) | 2007-03-29 |
EP1530708B1 (en) | 2006-05-17 |
WO2004074800A1 (en) | 2004-09-02 |
HK1072465A1 (en) | 2005-08-26 |
CN1692275A (en) | 2005-11-02 |
EP1530708A1 (en) | 2005-05-18 |
JP2005525582A (en) | 2005-08-25 |
JP4084803B2 (en) | 2008-04-30 |
TW200537082A (en) | 2005-11-16 |
AU2003287046A1 (en) | 2004-09-09 |
ATE326688T1 (en) | 2006-06-15 |
CN100357699C (en) | 2007-12-26 |
TWI277728B (en) | 2007-04-01 |
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